TDA9610 datasheet(38/41 Pages) PHILIPS

38 / 41 page

1995 Mar 21

Philips Semiconductors

Product speciﬁcation

Audio FM processor for VHS hi-ﬁ audio

TDA9610H

Adjustment of VCO frequency

Set the TDA9610H in record mode (NTSC off), no audio

input signal.

Measure the frequency at FMOUT (pin 56) with a

frequency counter and use the VCO TEST modes

(see Section “Function byte”) to output only the channel of

interest.

Adjust the VCO frequencies to 1.4 MHz

±10 kHz and

1.8 MHz

±10 kHz by means of the potentiometers at

pin 64 (FADJL) and pin 53 (FADJR).

When NTSC is to be the main video standard, set

NTSC on and adjust to 1.3 MHz and 1.7 MHz for optimum

frequency accuracy.

Standard FM deviation and audio level

Reference levels of frequency deviation and audio output

level are set by the resistor value at pin 24 (RVAR);

simultaneous for left, right, playback and record. Typical

resistor values can be calculated with equation:

Where:

∆f = reference FM deviation.

A = reference audio output level (1 kHz audio

frequency).

If adjustment for overall tolerance is needed, R has to be

made adjustable for the range 0.7Rtyp to 1.4Rtyp.

Set the TDA9610H in playback. Use a HF test generator to

make a carrier of 1.4 MHz with the desired modulation and

input this signal at FMINL (pin 61) or before the band-pass

filter and measure the audio output level at LINEL (pin 27).

typ

∆f

50 kHz

------------------



 2

400 mV (RMS)

---------------------------------------





----------------------------------------------

2.2 k

Ω

Power-down mode

To lower the dissipation in a stand-by situation, the 12 V

supply voltage at pin 19 (VDDA1) and pin 20 (VDDH) may be

switched off, with pins 19 and 20 ‘floating’. No low-ohmic

DC path to ground may be seen from pins 19 and 20,

because this will drain extra current from the 5 V supply via

these pins to ground.

Because of the fact that the I2C circuitry and the digital

outputs RAF, NTSC and XS are supplied via the 5 V

supply, no I2C settings will be lost and the output pins can

still be used.

For instance, XS can be used to drive external mute

transistors to mute the DC jump at the line outputs when

switching the 12 V supply.

RAF I/O

The status of the I2C RAF bit is output at pin 14

(RAF = HIGH; record). This output can be used to switch

the audio FM head amplifier to playback and record. If

accurate fast switching of the TDA9610H is needed, this

pin can also be used as input. Thereby overruling the I2C

RAF bit. To make this possible the RAF output is current

limited.

When using the RAF pin as output, no more than 35

µA

(LOW) and 185

µA (HIGH) current may be drawn from this

pin to assure the mode of the TDA9610H is not changed.

When using the RAF pin as input, the voltage source used

must be capable of delivering at least 345

µA (forced

HIGH;

>3.5 V) or sinking at least 65 µA (forced

LOW;

<1.5 V).

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